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Questions and Answers
What is the primary function of radiographic contrast?
Which term describes images with a higher difference between densities?
What defines low contrast in radiography?
What does Automatic Rescaling do in digital radiography?
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What role does the computer play in digital radiography?
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Which of the following best describes high contrast images?
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How does a histogram function in digital imaging?
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What is bit depth associated with in digital radiography?
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What primarily controls subject contrast in imaging?
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What happens when window width is increased during post-processing?
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Which characteristic does NOT influence subject contrast?
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What does a high kVp lead to in terms of subject contrast?
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How does a low kVp setting affect the x-ray beam?
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What is the result of using an incorrect Look Up Table (LUT) for an imaging exam?
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What does 'windowing' refer to in the context of image processing?
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Which of the following statements is true regarding homogeneous objects in radiography?
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Study Notes
Radiographic Qualities
- Four key radiographic qualities are density, contrast, detail, and distortion.
- Density is the overall blackness of the image, or the number of photons that strike the image receptor.
- Contrast is the difference in densities or shades of gray on the image.
- Detail refers to the sharpness or clarity of the image.
- Distortion refers to the misrepresentation of the size and shape of the object being imaged.
Contrast
- Contrast is the difference in densities, visible as shades of gray.
- High contrast images have a short scale contrast, producing many blacks and whites with few shades of gray.
- Low contrast images have a long scale contrast, producing many shades of gray.
Digital Radiography
- Digital radiography uses an image receptor (IR) that converts x-rays into an electronic signal.
- This signal is sent to a computer that creates a histogram, which is a representation of the x-ray exposure.
- The computer then applies a look-up table (LUT) to the histogram to adjust the contrast and brightness of the image.
Windowing
- Window width in post processing determines the range of gray scales (contrast) of the image.
- Narrowing the window width increases contrast.
- Widening the window width decreases contrast.
Subject Contrast
- Subject contrast is the range of differences in intensity of the x-ray beam after it has been attenuated by the patient.
- Subject contrast is influenced by the attenuation properties of different tissues in the body.
- Subject contrast cannot be manipulated by post processing.
Kilovoltage Peak (kVp)
- kVp is the primary controlling factor for subject contrast.
- Increasing kVp results in low contrast (long scale) images with many shades of gray.
- Decreasing kVp results in high contrast (short scale) images with few shades of gray.
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Description
Explore the four key radiographic qualities: density, contrast, detail, and distortion. Learn how each quality affects the clarity and interpretation of radiographic images. This quiz will enhance your understanding of digital radiography and its applications.
